#define _CRT_SECURE_NO_WARNINGS  
#include<stdio.h>
int maintest00()
{
	int arr[10] = {0};
	int a = 0,i=0;
	for (i = 0;i < 10;i++)
	{
		scanf("%d ", &a);
		arr[i] = a;
	}
	int sum = 0;
	double average = 0;
	for (i = 0;i < 10;i++)
	{
		sum += arr[i];
	}
	average = sum / 10.0;
	printf("%.1f", average);
	return 0;
}